Mafac or Spidel brakesets would both be correct on the bike, as Mafac made LS2 sidepulls for Spidel..... They all came from the same Mafac factory.....
My 84 Peugeot Peugeot PSV has a Mafac branded LS2 brakeset, while my Vitus Carbone 7 has a Spidel branded LS2 brakeset. The two brakesets are identical, down to the finish on them, except for the branding on the levers and the calipers....although the Spidel brakest did come with Mafac branded brake pads.....
Either way, those are pretty much the best sidepull brakesets made by France in the 80's